dCS Puccini U-Clock

November 30, 2009 - 9:31pm

haroon

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dCS Puccini U-Clock

December 1, 2009 - 5:03am

Editor

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Quote:
Can somebody help me understand what does the widening/broadening of central peak, representing the 11.025kHz tone explains/means in the jitter test of dCS Puccini U-Clock?

The broadening of the single peak (not a double peak, please note; this is a visual illusion due to the fact that the top of the graph is -70dBFS, not 0dBFS) is due to the presence of low-frequency, probably random noise-like variations in the clock frequency.

John Atkinson
Editor, Stereophile

December 5, 2009 - 4:32pm

haroon

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Hi John:

Thank you for the help; you have been a very kind editor, always come forward to help us even on the face of all the opposition.

From your post what I understand is that the visual thickening/broadening of the central peak, representing the 11.025kHz tone, perhaps

Represents the time accuracy of clock oscillator that manufacturer markets as,

December 6, 2009 - 9:20am

Editor

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Quote:
However, the question remains that why such thickening/broadening of the central peak is more prominent as to become split when USB is digital source than other sources, say S/PDIF.

Presumably because there are still random low-frequency variations in the recovered clock for USB-derived data that are not present with S/PDIF data. I woudn't be concerned about this - USB audio data decoded by the Puccini and U-Clock produced possibly the best sound quality I have heard for computer-sourced audio in my system (along with the Ayre QB-9).

John Atkinson
Editor, Stereophile

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